<template>
  <div>
       <!-- 面包屑区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>数据统计</el-breadcrumb-item>
      <el-breadcrumb-item>数据报表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
        <!--2. 为ECharts准备一个具备大小（宽高）的Dom -->
        <div id="main" style="width: 750px;height:400px;"></div>
    </el-card>
  </div>
</template>

<script>
// 1. 导入 echarts 
import echarts from 'echarts'
import _ from 'lodash'
  export default {
      data() {
          return {
              options: {
                title: {
                text: '用户来源'
                },
                tooltip: {
                trigger: 'axis',
                axisPointer: {
                    type: 'cross',
                    label: {
                    backgroundColor: '#E9EEF3'
                    }
                }
                },
                grid: {
                left: '3%',
                right: '4%',
                bottom: '3%',
                containLabel: true
                },
                xAxis: [
                {
                    boundaryGap: false
                }
                ],
                yAxis: [
                {
                    type: 'value'
                }
                ]
            }
                }
      },
      created() {

      },
      // 此时, 页面上的元素 已经渲染完毕了
     async mounted() {
          //3. 基于准备好的dom，初始化echarts实例
        var myChart = echarts.init(document.getElementById('main'));

        // 发送请求数据
        const {data: res} = await this.$http.get('reports/type/1')
        // 判断状态码是否为200
        if(res.meta.status !== 200) {
            return this.$message.error('获取折线图失败!')
          }
        // 4. 指定配置项和数据
        const result = _.merge(res.data, this.options)
        // 5. 使用刚指定的配置项和数据来显示图表
        myChart.setOption(result);
      },
      methods: {

      }
}
</script>

<style lang="less" scoped>
</style>
